forked from zelo72/mastodon-ios
30 lines
1.0 KiB
Swift
30 lines
1.0 KiB
Swift
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// CellFrameCacheContainer.swift
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// TwidereX
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//
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// Created by Cirno MainasuK on 2021-10-13.
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// Copyright © 2021 Twidere. All rights reserved.
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//
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import UIKit
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protocol CellFrameCacheContainer {
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var cellFrameCache: NSCache<NSNumber, NSValue> { get }
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func keyForCache(tableView: UITableView, indexPath: IndexPath) -> NSNumber?
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}
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extension CellFrameCacheContainer {
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func cacheCellFrame(tableView: UITableView, didEndDisplaying cell: UITableViewCell, forRowAt indexPath: IndexPath) {
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guard let key = keyForCache(tableView: tableView, indexPath: indexPath) else { return }
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let value = NSValue(cgRect: cell.frame)
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cellFrameCache.setObject(value, forKey: key)
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}
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func retrieveCellFrame(tableView: UITableView, indexPath: IndexPath) -> CGRect? {
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guard let key = keyForCache(tableView: tableView, indexPath: indexPath) else { return nil }
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guard let frame = cellFrameCache.object(forKey: key)?.cgRectValue else { return nil }
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return frame
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}
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}
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